Martin Cuddihy visits Kruger National Park to investigate the poaching of rhino horns, amid calls by some ecologists to legalise the illegal trade in order to conserve the endangered animals. (Confronting images.)

Martin Cuddihy visits Kruger National Park to investigate the poaching of rhino horns, amid calls by some ecologists to legalise the illegal trade in order to conserve the endangered animals. (Confronting images.)